Fics like Dust in the Wind

In 1998 a young Mary Campbell refuses a demon deal because she hasn't met John yet. Instead she signs a contract with a military program claiming to have genetically engineered children who will produce better immunizations. Of course she'd be the one to agree to (unknowingly) work for Manticore. Upon learning the truth she is terrified of the child growing in her womb. She meets John Winchester and learns the child is at least human looking. Falling in love with the soldier and the unborn transgenic they escape Manticore. Together the couple raise the boy as Dean Winchester, and for a while they're happy. They have a second child four years later, Sam, and everything is perfect. Until Dean displays feats of inhuman strength. Then someone sees the barcode his parents have desperately tried to hide.

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